China has postponed its requirement that all PCs sold in the country include Web filtering software known as Green Dam.

According to a post on the Web site of the state-controlled news agency Xinhua, China's Ministry of Industry and Information Technology (MIIT) said late Tuesday that the pre-installation requirement would be delayed because computer makers wanted more time for such a massive undertaking.

The MIIT had set July 1 as a deadline and some computer manufacturers have already begun complying with the order. Sony has started shipping PCs with Green Dam, accompanied by disclaimer about the risks posed by the software. Acer has reportedly expresses its intent to comply.

No new deadline was disclosed, leaving open the possibility that China might decide to abandon the filtering requirement.

The MIIT said that it would continue to provide Green Dam as a free download for users who wanted it, and would install the software on computers in schools and public Internet cafes. It intends to "keep on soliciting opinions to perfect the pre-installation plan," the Xinhua News Agency said.

The U.S. government, trade groups, and Internet users -- inside and outside China -- have objected to the Chinese government's Web filtering mandate.

Green Dam is supposed to block "unhealthy" content, such as pornography, but computer researchers who have studied the program say that it also blocks terms that are politically sensitive in China. The software has also been shown to have significant security vulnerabilities.

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